On page BF-28 of the Nissan 300 ZX Service Manual, illustration #16 shows what they call the Rear Door Finisher (hatchback finisher?). In other places, it's called the third brake light.
It's that plastic strip that attaches to the bottom of the hatchback door and sits just above the brake lights. It's also where the "Nissan" and "Twin Turbo" decals attach.
Mine broke and I'm looking for a used one in good-excellent condition, with all the attachment hardware intact. Feel free to call me at 702-492-6962 if you think you may have what I'm looking for.
Dean-o
Follow Ups
third brake light needed, 1994 tt - Dean-o20:04:14 08/17/20